Kito S, Okuda K, Miyazawa K, Sato K
Department of Veterinary Obstetrics and Gynecology Obihiro University of Agriculture and Veterinary Medicine Obihiro, Hokkaido, Japan.
Theriogenology. 1986 Feb;25(2):325-33. doi: 10.1016/0093-691x(86)90068-3.
A transrectal real-time B mode linear scanner was used to learn if the appearance of a cavity in the corpus luteum (CL) in cows causes infertility. Sixty-one cows that were confirmed to have ovulated after artificial insemination (AI) were used. Some of the cows that returned to estrus were examined two or three times; thus, a total of 78 observations were made. The rate of cavity appearance was 37.2% (29 78 ). In relation to the size of cavity, the rates of appearance were 30.8% of CL with cavities of 7 mm or greater and 24.4% with cavities of 10 mm or greater in diameter. It took more than 21 days for the cavity more than 10 mm to disappear. In the cows that were observed two or three times, the cavity did not tend to reappear. The mean period for return to estrus, mean serum progesterone concentration and mean pregnancy rate were not significantly different (P>0.05) for cows that had CL with or without a cavity. Our results suggest that the cavity mentioned above does not cause infertility.
使用经直肠实时B型线性扫描仪来研究母牛黄体（CL）中出现腔隙是否会导致不孕。使用了61头经人工授精（AI）后确认排卵的母牛。一些返情的母牛接受了两到三次检查；因此，总共进行了78次观察。腔隙出现率为37.2%（29/78）。就腔隙大小而言，腔隙直径为7毫米或更大的CL出现率为30.8%，直径为10毫米或更大的出现率为24.4%。直径超过10毫米的腔隙需要21天以上才能消失。在接受两到三次观察的母牛中，腔隙没有再次出现的趋势。有腔隙或无腔隙CL的母牛，其返情平均周期、血清孕酮平均浓度和平均妊娠率没有显著差异（P>0.05）。我们的结果表明，上述腔隙不会导致不孕。
